1. 2Department of Botany and the Genetics Institute, University of Florida, Gainesville, Florida 32611 USA;
2. 3School of Biological Sciences, Washington State University, Pullman, Washington 99164 USA;
3. 4Florida Museum of Natural History and the Genetics Institute, University of Florida, Gainesville, Florida 32611 USA;
4. 5Royal Botanic Gardens Edinburgh, 20A Inverleith Row, Edinburgh EH3 5LR, Scotland, UK;
5. 6Institute of Systematic Botany, University of Zurich, 8008 Zurich, Switzerland;
6. 7Molekylärsystematiska Laborataoriet, Naturhistoriska Riksmuseet, Box 50007, S 104 05 Stockholm, Sweden